Understanding the Cost: How Much is a London Fractional CFO?

For a growing London business, a fractional CFO offers senior financial leadership without the cost of a full-time appointment — but how much does one actually cost? It is one of the first questions businesses ask, and a fair one, because the answer determines whether the model makes sense for them. The short answer is that a fractional CFO costs a fraction of a full-time CFO, with the exact figure depending on the seniority required, the scope of work and the time commitment. This guide sets out what a London fractional CFO typically costs, what drives the price, how engagements are usually structured, and how the economics compare with a full-time hire once employer costs are included.

Understanding the cost is the first step to deciding whether a fractional CFO is right for your business. The figures below are typical market ranges rather than a price list: rates vary with the individual, the sector and the brief, and the right number for your business only becomes clear once the scope is pinned down. The honest answer to “what will it cost?” is that it depends on what you need — a business wanting a day a week of strategic oversight will pay very differently from one that needs an experienced CFO to lead a fundraise or an acquisition.

What a Fractional CFO Costs in London

In London, fractional CFO costs are typically structured in one of a few ways, and the headline figures give a useful starting point. As a typical market range, hourly rates for fractional CFOs in London generally run from around £100 to £300 per hour, depending on the CFO’s experience, sector expertise and the complexity of the work. More senior CFOs with specialist experience — in fundraising, M&A or a particular industry — tend to sit at the higher end of that range, and some command more.

Many engagements are structured as a monthly retainer rather than hourly, which gives both sides a predictable cost. Again as a broad, indicative market range, monthly retainers for a fractional CFO in London commonly fall somewhere between £5,000 and £15,000 per month, depending on the days per week involved and the seniority required. A business needing a day a week of strategic oversight will usually sit toward the lower end; an engagement of two or three days a week through a funding round or an integration will sit higher.

Three points are worth keeping in mind when reading any figure, including these:

• They are not fixed tariffs. Rates are agreed individually and move with demand, the candidate’s other commitments and how attractive the brief is.
• They are usually quoted before VAT, and most fractional CFOs work through their own limited company, so the invoice you receive may carry VAT on top.
• London pricing tends to run higher than in many regions, but remote and hybrid working has narrowed the gap. A business in London can engage a strong CFO based elsewhere, provided they can be on site when it matters.

The right structure depends on the nature and intensity of the work, which is why it is worth discussing your specific needs rather than relying on headline figures alone.

What Drives the Cost

Several factors influence what a fractional CFO costs, and understanding them helps a business anticipate the price for its situation. Together they determine where in the range a particular engagement will sit.

Experience and track record

The most significant factor is experience. A CFO with an extensive track record, specialist sector knowledge, or experience of complex situations such as fundraising, exits and acquisitions commands higher fees, because that experience changes outcomes. A CFO who has already taken two businesses through institutional investment will price differently from a capable finance lead stepping up to a CFO title for the first time. A business hiring for a specific, demanding challenge should expect to pay for the seniority that challenge requires.

Scope of the remit

Basic financial oversight and board reporting costs less than comprehensive strategic work — fundraising, M&A, transformation, pricing strategy, treasury and risk management — so the breadth of the remit shapes the cost. If the brief also expects the CFO to do hands-on work because there is no finance team underneath them, that changes both the time needed and the type of person who fits.

Time commitment

The more days per week or month a fractional CFO dedicates to a business, the higher the total cost, though the effective day rate often improves with greater commitment. A predictable two days a week is easier for a CFO to plan their portfolio around than ad hoc hours, and that is often reflected in the rate.

Sector and regulation

Some sectors narrow the pool. A regulated financial services firm, a business with complex revenue recognition, or a company with international subsidiaries needs a CFO with directly relevant experience, and there are fewer of them available on a part-time basis. Scarcity pushes the price up.

Urgency

A business that needs someone in place within weeks — because a funding round has a deadline, an auditor has raised concerns or the previous finance lead has left — has less room to negotiate than one planning ahead. Starting the search before the need becomes pressing is usually the cheapest thing a business can do.

Pricing Models: Hourly, Retainer and Project

Fractional CFO services are typically priced in one of three ways, with a day rate sitting underneath most of them. The right model depends on whether the need is occasional, ongoing or a defined project.

Hourly

The hourly model — typically in the region of £100 to £300 per hour in London, though individual rates vary — is flexible and straightforward, letting a business pay only for the time it uses. It suits startups and smaller businesses that need expert guidance on an as-needed basis: reviewing a model before an investor meeting, sense-checking a budget, or sitting in on a board meeting. The drawback is that hourly arrangements rarely buy real ownership. A CFO dipping in for a few hours cannot be accountable for the finance function.

Retainer

The retainer model — a fixed monthly fee, broadly £5,000 to £15,000 in London as a typical range depending on days and seniority — provides a predictable cost and ensures the CFO is regularly available. It is usually built from an agreed number of days per month at a day rate, and it suits businesses needing ongoing strategic leadership: monthly reporting, cash management, board packs and investor relations. Most long-running fractional CFO relationships end up on this footing.

Project

Project-based pricing agrees a fee for a defined piece of work such as a fundraise, a finance systems implementation or preparing for due diligence. It gives certainty on cost, but only if the scope is tightly defined. Fundraises in particular tend to run longer than planned, so it is worth agreeing in advance what happens if the timetable slips.

Contracting, IR35 and Other Costs to Budget For

The rate is not the only cost. Before signing, a business should be clear on how the CFO will be engaged and what sits around the fee.

Employment status. Most fractional CFOs invoice through a limited company, which brings the off-payroll working rules (IR35) into play. HMRC’s guidance on understanding off-payroll working explains that, in most cases, a medium or large client is responsible for deciding the worker’s employment status and should produce a status determination statement with its reasons; where the client is small and outside the public sector, the worker’s own company makes that decision instead. If an engagement is found to be inside the rules, the cost to the business changes, so it is worth considering this at the outset rather than after the contract is signed. HMRC also publishes specific guidance on off-payroll working for clients.

Recruitment fees. If a search firm introduces the CFO, there will be a fee, either as a one-off placement fee or built into the day rate. Ask how it is calculated and what happens if the engagement ends early.

Expenses and systems. Agree in advance whether travel to the London office is included, and budget for any software licences, audit support or legal advice the CFO will need to do the job properly.

Insurance. If the CFO will be a statutory director or take decisions with real financial consequences, check what professional indemnity cover they hold and whether your directors’ and officers’ policy needs extending.

Fractional CFO vs Full-Time CFO: The Economics

The cost of a fractional CFO is best understood against the alternative. A full-time CFO in London commands a considerable salary, usually with bonus, benefits and often equity on top. For many growing businesses that is a cost they cannot yet justify, however much they would value the expertise.

The salary is also not the full cost of employment. Since 6 April 2025, employers have paid secondary Class 1 National Insurance at 15% on earnings above a secondary threshold of £5,000 a year, up from 13.8% above £9,100, according to the government’s policy paper on the change. As a purely illustrative example, a CFO on a hypothetical £180,000 salary would carry around £26,250 a year in employer National Insurance on the salary alone — before bonus, which also attracts National Insurance. Employers must also make workplace pension contributions of at least 3% of qualifying earnings under automatic enrolment, and senior packages usually go well beyond that minimum.

Add the less visible costs — a permanent recruitment fee, holiday and sick pay, equipment, and the notice period and potential settlement if the hire does not work out — and the true annual cost of a full-time CFO sits well above the headline salary. A fractional CFO’s fee, by contrast, is close to the full cost: there is no employer National Insurance or pension on a limited-company invoice (assuming the engagement falls outside IR35), no holiday pay and usually a short notice period.

That does not make a fractional CFO automatically cheaper per day. The day rate is higher than the daily equivalent of a salary, because the CFO carries their own overheads, gaps between engagements and risk. The saving comes from buying only the days the business needs. A business engaging a fractional CFO for a day or two a week gains genuine CFO-level judgement for a fraction of the full-time cost, and can scale the arrangement up or down as its needs change, including toward a full-time appointment as it grows. When that point comes, our CFO recruitment practice handles the permanent search.

Fractional, Part-Time or Interim?

The label affects the price, so it helps to be clear which model you are buying. A fractional CFO typically works a set number of days across a portfolio of clients and stays for months or years. A part-time CFO arrangement is similar in time commitment but is often an employed or longer-term role with a single business. An interim CFO works full-time for a fixed period, usually to cover a gap, steady a business in difficulty or deliver a transaction — and because they are full-time, the monthly cost is considerably higher even if the day rate is similar.

The question to ask is not which model is cheapest, but which matches the workload. A business that genuinely needs five days a week of senior finance input for six months will get poor value from a one-day-a-week fractional arrangement, and a business that needs a day a week will overpay for an interim. Our comparison of fractional, interim and full-time leadership sets out the trade-offs in more detail.

Is a Fractional CFO Worth the Cost?

For the right business, a fractional CFO is not just affordable but valuable. The strategic financial leadership a strong CFO brings — better decisions, a credible fundraise, sound planning, tighter cash control — can change the trajectory of a business, and accessing it without a full-time cost is often the right call. The question is less ‘can we afford it?’ than ‘what value would it bring?’ — and for a business at the right stage, the answer is often considerable. Our guide on when to consider a fractional executive explores the signals that a business is ready.

Typical signs that the cost will pay back include:

• You are preparing to raise equity or debt and investors expect a credible finance lead and a defensible model.
• The founders or managing director are spending too much of their own time on finance decisions they are not equipped to make.
• You have a bookkeeper or financial controller but nobody turning the numbers into decisions on pricing, margins and cash.
• The business is planning an acquisition, a sale or international expansion and needs someone who has done it before.

As with any senior appointment, the value depends on the right person: an experienced CFO who fits the business’s needs, stage and situation. At Exec Capital, we help businesses find and appoint the fractional CFO who brings real value — matched to what the business needs and at a cost that makes sense. Our searches are run by our specialist team, with Adrian Lawrence FCA, a Chartered Accountant and former listed-company Finance Director, overseeing each mandate.

How to Get Value From the Engagement

A fractional CFO’s cost is fixed by the rate and the days; the value is set by how well the engagement is scoped and run. A few practical steps make the difference.

• Write down the outcomes, not just the tasks. “Close a Series A within nine months” or “monthly management accounts to the board by working day ten” gives both sides something to measure against.
• Match the days to the work. Agree a baseline commitment and how extra days will be charged during peaks such as year end or due diligence.
• Make sure the basics are in place. A CFO spending expensive days reconciling ledgers is poor value. If the bookkeeping or controller layer is weak, fix that first or budget for it.
• Review at three and six months. Check whether the time commitment is still right, and plan the step to a full-time hire if the business has outgrown the arrangement.

Further Reading

This guide sits alongside our wider fractional resources. For the full range of part-time senior roles, see our fractional C-suite practice. If you have decided a fractional finance lead is the right step, our fractional CFO recruitment page explains how we approach the search and what to expect from it.

Frequently asked questions

How much does a fractional CFO cost in London per month?

As a typical market range, monthly retainers commonly fall somewhere between £5,000 and £15,000, depending on the days involved and the seniority required. Individual rates vary, so treat this as a starting point rather than a quote.

How many days a week does a fractional CFO usually work?

Most engagements run from a few days a month to two or three days a week. The right level depends on the workload: a fundraise or integration needs more time than steady-state reporting and board support.

Is a fractional CFO cheaper than a full-time CFO?

Usually, in total cost. The day rate is higher than a salaried day, but you pay only for the days you use and avoid employer National Insurance, pension contributions, holiday pay and long notice periods.

Does IR35 apply to a fractional CFO?

It can. If the CFO works through their own company, the off-payroll working rules need to be considered. For medium and large clients, the client normally decides status and issues a status determination statement.

When should a business move from a fractional to a full-time CFO?

Typically when the fractional CFO is consistently working close to full-time, when investors require a permanent CFO, or when the finance team has grown to the point that it needs daily senior leadership.